Means for cleaning floors in textile mills



March 31, 1959 W. F. DENNING 2,879,536

MEANS FOR CLEANING FLOORS IN TEXTILE MILLS March l31, 1959 w. F. DENNING2,879,536

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MEANS Fon CLEANING FLOORS 1N TEXTILE MILLS) Filed Nov, 12. 1954ATTORNEYS March 31, 1959 w. F. DENNING 2,879,536

MEANS FOR CLEANING FLOORS IN TEXTILE MILLS Filed Nov. l2. 1954 6Sheets-Sheet 5 ZJ g'- 7 3l) 72 517 I(32 38) 4f Y 53 R f7 52 3o w+. l:III El l J l 50- 30 4e (45 45 a0 21,2919 WADE E DENNING,

INVENT OR V BY @4MM ATTORNEYS.

March 31, 1959 w. F. DENNING MEANS FOR CLEANING FLOORS IN TEXTILE MILLS6 Sheets-Sheet 6 Filed Nov. l2, 1954 INVENTOR: WADEF. DENMNG.

ATTORNEYS Unified States ice MEANS FOR CLEANING FLOORS IN TEXTILE MILLSWade F. Denning, Albemarle, N. C., assignor to The` Denning Company,Inc., Albemarle, N. C., a corporation of North Carolina 1 ApplicationNovember 12, 1954, Serial No. 468,259l

` 7 Claims. (Cl. 15-312) mulation of short bers, lint and any looseforeign mat ter beneath the rows of textile machines wherein the bottomportions thereofare not enclosed.

It is well known that the making of threads and yarnsI Ifrom textilelbers includes the cleaning'and blending of the bers and then drawingthem out through various operations so that individual fibers tend tobecome parallel and to form endless, rope-like strands generally: knownas roving. This roving isy formedV on various types of machinesincluding roving frames'or ilyr frames and individual strands are alsoformed on spinning frames and, in many instances, several strands of'the spun yarn are twisted together by the use of twisting frames.ADuring the forming ofthe roving and yam'and during the twisting andspinning operations, the short broken. fibers insecurely retained bylonger bers, known as fly or lint, tend to be thrown out to float in theair and settle on various parts of the correspondingmachines. However,most of the fly or lint settles on the floor beneath the machine. Insome instances, means are provided to remove the accumulation of fly orlint from the various parts of the machine, butmeans have not beenprovided heretoforeA to remove'such accumula*` tions from beneath themachines and. from the aisles between the machines with the results thatit has, been necessary to collect-and remove the accumulated lint:manually, as by sweeping, which requires a large expenditure for labor.

It is evident that by manually removing 'textile bers and the like frombeneath the textile machines, the lint and other particles would bescattered and would then contaminate the lair inthe room in which themachin- 2,879,536 Patented Mar. 31, 1959v chimes and the islestherebetween,r wherein a plurality ery was located. Moreover, the dust,lintV and other particles which were removed'from the machinery wouldultimately settle upon the yarn and loose lint'particles would oftenresult in asubstantial amountof y,V rlint or the like winding up in theyarn as gouts and slugs which causes weakness and breakage and loss ofyarn product. Another most objectionableV condition result-` ing fromlint and the like thereof being allowed to accumulate beneath themachines is a hazard of destructive flash fires. l

It is therefore the primary object of this invention to provide a meansfor cleaning the floors beneath textile machines embodying a simple,economically constructed and maintained means which mayoperateIcontinuously to prevent accumulations oflint and other loose mattei?upon the iloor of the room in `which machines of the improved means ofcleaning floors beneath'v 'textile'inaf of machines are arranged inparallel spaced relation'fto each other to form a row or rows ofmachines, whereby particles of lint and the like which become detachedfrom the threads or yarns passing through each of the machines and whichtloat to the oor beneath the machines will fall into a continuouslymoving stream of air which moves longitudinally beneath each of themachines. Thus, the stream of air will blow the particles of lint andthe like from beneath one machine across the intervening alley way`between said rows of machines to the next adjacent machine and themoving stream of air beneath said next adjacent machine will blow theparticles of lint to the next succeeding machine, etc. The particles oflint or the like are successfully blown or moved from one rowof machinest-o the next row of machines and each ofthe machines in the last row ofmachines ladjacent a wall of the room in which the machines are placedhas means associated therewith for blowing the accumulated lint from allthe machines in a given group of rows of machines to said wall and meansfor directing the accumulated lint along said wall into a corner of theroom for collection therein by a suitable duct system for carrying thelint and the like to other points in the textile mill where the bers maybe reprocessed.

It is another object of this invention to provide a means for cleaningthe oors in textile mills beneath textile machinery wherein the size ofthe room and number of textile machines placed therein determine thedirection of flow of the air stream so that in a small room where theaccumulation of lint from each row of spinning frames or the like isrelatively small, the air will be directed to one corner of the room forcollection purposes. In a room having say -sixteen rows of textilemachinery, the air may be directed to opposite sides of the room fromthe center land collected into different collection points and wherethere are extremely long rows of sixteen rows of textile machines in asingle room, the ow of air can be directed from the center of the roomto all four corners and collected in each corner to thus preventexcessive accumulation of lint to thus minimize the size of the blowerunits associated with each of said textile machines.

Some of the objects of the invention having been stated,l other obectswill appear as the description proceeds when taken in connection withthe accompanying drawings, in which- Figure l is a schematic plan viewof a room showing an embodiment of the invention and wherein theoutlines of the textile machines, such as spinning frames and the likeare shown as rectangles with the blowers associated therewith beingshown schematically;

Figure 2 is a view similar to Figure 1 except showing anotherarrangement of the blowers and the nozzles suitable for a larger room inwhich there are a greater number of textile machines;

Figure 3 is another view similar to Figure l but showing a room ofapproximately -four times the size of the room shown in Figurev l andshowing the preferred direction vof the ilow of air from the blowers `ina room of this size to prevent excessive accumulation of lint;

Figure 4 is a transverse longtiudinal sectional view through a typicalspinning frame and showing the man ner in which a blower unit may beattached thereto;

Figure 5 is an enlarged side elevation of the blower i unit and thetracks supporting the same;

Figure 6 is a view of the front end of `the blower unit looking alongthe liner6-6 in Figure 5;

Figure 7 is a plan view of the under kframe blower unit and showing oneform of auxiliary blowing means for cleaning the cross-alleys betweenthe rows of textile machines;

Figure 8 is a view similar to Figure 7 except showing a modified form ofa cross-alley cleaning mechanism;.

Figure 9 is a view similar to Figure 8 except showing still anothermodified form of cross-alley cleaning mechamsm;

Figure l is a view showing another arrangement of the blowers andnozzles associated with spinning frames and the like and showing thearrangement when used in conjunction with a collection bin;

Figure ll is a transverse vertical sectional view through the lowerportion of a typical spinning frame and showing the manner in which thecollection binl isy mounted on the floor therebeneath;

Figure 12 is an isometric view of one end of the collection bin removedfrom beneath the spinning frame;

Figure 13 is a transverse sectional view through the collection bin andbeing taken substantially along thel line 13-13 in Figure 12.

Referring more specifically to the drawings, the numeral 10, in Figure1, generally designates the walls of a room of a textile mill or`planthaving a oor 11 on which a plurality of transverse and longitudinal rowsof textile machines 12 are supported. The terms transverse andlongitudinal rows correspond with the transverse and longitudinal axesof the machines, these textile machines all being seubstantiallyidentical and being in the category of spinning frames, twister frames,winders and the like, that is, machines of the type which are open attheir lower portions. As is well known, each of the machines 12 (Figure4) includes a frame 20 having a creel 21 on the upper portion thereofwhich supports a plurality of spools or bobbins 22 or other means fordirecting yarns Y through respective series of drawing rolls 23 fromwhence the yarn Y passes downwardly and is wound about bobbins or spools24 disposed at opposite sides of the machine. The bobbine or spools 24are usually driven by tapes or cords 25 which pass around a cylinder 26which are driven in the usual manner.

As heretofore stated, as the yarn Y passes from the source 22 to thebobbin or spool 24, particles of lint, y and foreign matter becomedetached from the yarns or threads and accumulate beneath the machine.

In order to prevent such accumulations of lint and the like beneath themachines, I have provided a unique means for continuously moving thelint from beneath one machine to the next adjacent machine, etc., alonga transverse row of machines with means being provided beneath the lastmachine in said row for moving accumulations of lint and the like alongthe wall `adjacent the last row of machines and to a suitable collectiondev1ce.

This is accomplished by creating currents of moving air beneath themachines to keep lint, fly and the like in substantially constantagitation along the tioor so as to prevent the accumulation of lint andthe like on the floor under the machines and to move any accumulationswhich might occur. The air currents are preferably created by a seriesof under frame blowers mounted on the individual machines and arrangedto move longitudinally beneath the machines and to direct air outwardlyfrom-beneath each machine and along the fioor in a predetermined patternto keep the oor clean. v

In the preferred arrangement, a pair of channel shaped tracks 30 and 31(Figures 5, 6, 7, 8 and 9) are suitably mounted beneath each machine anda blower unit broadly designated at 32 is supported and driven on thesetracks longitudinally of the machine. Although the tracks 30 and 31 areshown in Figure 4 as depending from the frame 20 beneath the machine itis to be understood that the tracks may be supported on the oor or inany other desired manner beneath the textile machines 12.

The illustrated blower unit 32 (Figures 5 and 6) comprises a fan bladehousing 33 having a blade type blower 34 rotatably mounted therein andfixedly mounted on the end of a motor shaft 35 which is rotatable by anelectric motor 36 suitably secured to the fan housing 33. The electricmotor 36 has electrical energy'transmitted thereto by a pair of brushes38 riding on electrical contact strip 39 and 39a suitably secured to andinsulated from the track 31.

The opposite end of the motor 36 has a transmission unit 37 fixedthereto which is driven by the electric motor 36 to drive a pair ofreversible driving wheels 40 and 41 (Figures 5 and 7) which ride on theflanges of the channel-shaped tracks 30 and 31 respectively. The drivingwheels 40 and 41 are reversed by suitable linkage within thetransmission unit 37, not shown, and a shifter rod 45 (Figures 5, 6 and7) which is shifted by engagement with a pair of bunters 46, only one ofwhich is shown in Figures 7 through 9, to reverse the direction ofrotation of the driving wheels 40 and 41 in av manner well known in theart.

The fanv endy of the blower unit 32 is supported and guided by a pair offront grooved wheelsk and 51V riding 4in the channel-shaped track 30 and31 respectively and rotatably mounted on the legs of a substantiallyU-shaped member 52, the lower central portion of which has one end of apivot shaft 53 extending therethrough and the oppositeend of which isxedly embedded in the lower, central portion of the fan housing 33. f

The fan housing 33 has an opening 55 (Figure 5) therein for egress ofair which is forced outwardly therethrough by the fan blades 34 and isdirected as desired by a suitable nozzle 56. It is to be understood thatseveral different 'types and shapes of nozzles 56 (Figure l6) could beused to direct the air from the blower unit 32 along the lioor 11beneath the textile machines as desired.

Referring to Figure l, it will be noted that the no2'.-r zles 56 (shownsomewhat schematically) on the most of the blowers 32, in eachtransverse row, are facing at angles of approximately 90 degrees fromthe path of travel of the blowers along the tracks 30 and 31 whilethevlast two blowers in each transverse row have their noz'zles56inclined at an acute angle relative to the line -of travel of theblowers32 to thus gradually direct the accumulation of lint along the rearmostwall 10 of the room in which the textile machines are located. Theaccumulations of lint along the rearmost or left-hand Wallin Figure lare moved into the upper left-hand corner of the room to be taken up bya suitable collection device such as suction means indicated at 60 anddirected by'suitable ducts to other parts of the mill for disposal orreprocessing.

It is also noted that, the first longitudinal row of textile machines inthe right-hand portion of Figure l is provided with blowers havingauxiliary nozzles or split nozzles so that some of the air directedtherefrom is sent backwardly at an angle against the foremost orrighthand wall and some of the air is directed to the next adjacentlongitudinal row of textile machine 12. In Figure l means are shown forcleaning the alleys at the ends of the rooms comprising a pair oftracks, which are identical or similar to the tracks 30 and 31, mountedadjacent each end wall vand carrying suitable blowing means such asblowers 32 to direct air away from the end walls of the room to thuskeep the end alleys clean and work the accumulated lint into the upperleft-hand corner of the room in Figure l to be collected by the suctionmeans 60.

There are numerous means by which air may be dit rectedrto the crossalleys between the ends of the textile machines 12 for cleaning the sameand three such means are shown in Figures 7, 8v andJ 9. By referring toFigure`7 it will be noted that as the blower unit 32 moves from right toleft along the'tracks 30 and 31, the U- shaped bracket 52 will engageone end of acontrol wire 65, a medial portion of which ispivotallymounted as at 66 on the lower portion of the track 30. One end ofacontrol link 67 is pivotally -connected to the other end of the controlwire 65 and has its opposite end pivotally connected to a plate 68fxedly secured to the upper end of' a blower unit 70 which isoscillatably mounted as at 71 on a cross member 72 spanning the distancebetween the tracks 30 and 31. The blower unit 70 is resiliently urged ina clockwise manner by a spring 69, one end of whichA is secured to thetrack 30 andthe other end of which is secured to the control wire 65.

It is thus seen that, upon the U-shaped bracket 52 engaging the controlwire 65 the control wire 65 will pivot in a counterclockwise directionto thus pivot the blower unit 70 in a counterclockwise direction thusdirecting the stream of air therefrom in a sweeping motion across thecross alley between adjacent textile machines 12 in the same row. Uponthe blower unit 32 moving back tothe right in Figure 7, the blower 70will return to the position there shown. This periodic oscillatorymovement of the blower 70 creates suficient air currents across thecross alleys to clean the same.

In Figure 8 there is shown another means of directing air into `thecross alley between adjacent ends `of a pair of textile machines in thesame longitudinal row which comprises a duct 74 fixed on the floor ofthe room in which the textile machines are placed and having an open end75 which will periodically receive the nozzle 56 of the traveling blower32 and direct air therefrom longitudinally through the duct 74 andoutwardly diverging projections 76 and 77 thereon to thus sweep thecross alley between adjacent ends of the textile machines in the samelongitudinal row.

Referring to Figure 9 there is shown still another modified form ofnozzle for sweeping the cross alley between adjacent ends of textilemachines in the same longitudinal row which includes a pivoted ductmember or oscillatable nozzle 80, which is pivotally mounted on thefloor as at 81 and is provided with an` opening 82 for periodicreception of the nozzle 56 of the traveling blower unit 32. As theblower unit 32 moves from right to left in Figure 9 the nozzle 56 willengage duct 80 at the left hand edge of the opening82 to thus pivot theduct 80 from the position shown in solid lines in Figure 9 to theposition shown in dotted lines and thus direct a stream of air in asweeping motion across the cross alley between adjacent ends of textilemachines in the same row. By periodically directing air across the crossalleys, lint or other foreign matter in said cross'alleys will be movedunder adjacent machines and into the air currents beneath'said machinesfor collection and disposal as described.

Referring to Figure 2, 'it will be noted that a room in which textilemachinery is disposed is shown schematically as having sixteentransversel rows of four textile machines in each longitudinal row andwherein the nozzles on the blower units 32 are arranged so as to movethe lint on the floor of the room from the center of the room outwardlyto both side wallsv where the last two longitudinal rows of blowers 32have their nozzles directed at an angle relative to their path of travelto direct the accumulated lint into both the right and left uppercorners in Figure 2. The accumulated lint is then taken up in thecollection units 60 in both corners thereof to be removed to other partsof the mill. The upper and lower end walls are also provided withblowers 32 and trackways 30 and 31 for directing the accumulationof-lint toward both side walls where it is moved down k'the wall by theblowers32 on each of the last two longi- Itudinal rows of textilemachines. It is to be understood that, the ends of-each of 4the textilemachines 12`shown could be equipped `with cross alley cleaners such asshown in Figures 7 through 9, if so desired'. f'

Referringto Figure 3, still another size roomin which textile machineryis disposedv is shown schematically as having sixteen longitudinal rowsof eight; textile machines in each row and wherein the nozzles 56 on theblower units 32 are arranged so as to move the accumulated lint on theoor of the room from thev longitudinal center of the room outwardlytoward each of the side walls and where the last two longitudinal rowsofblowers haver their nozzles directed at angles relative to their path oftravel to direct the accumulated lint away from the transverse center ofthe room to both endwalls thereof. Suitable blower units 32-are alsoused at each end wall of the room for directing the accumulated lint inthe end alleys toward each corner of the room. It is thus seen that, thelint is accumulated and moved by the air streams from the blower units32- towards eachcornery of the room where the accumulation'is takenup inthe collection units 60 in each of the four corners of the room.

Generally speaking, the larger the room in which the textile machinesare disposed or the more textile machines placed in a room, the greaterthe number of collection points needed to take care of the accumulatedlint so that the lint accumulated by the blower units 32 will not becometoo large to be moved by this size blower unit. It is to be understoodthat, if it is found necessary to move a larger accumulation of lint,the size of the blower units 32 may be increased to take care 'of theincreased load requirement by providing a blower unit which will providea stronger or higher velocity air stream. l e If desired, thearrangement ofthe blowers 32 and a collection bin or entrapping elementshown in Figures 10-13 may be used where there are a large number oftextile machines in one room to collect the accumulated lint so that theblowers 32 do not have to move as large an accumulation oflint from onewall to another along an entire row. The collection bin 100'includes apair of base plate members 101 and 101 which are adapted to rest on theoor beneath the spinning frame 12 (Figure ll). The outer edges of thebase plates 101, 101' are turned back to form inclined portions 102 and102 which form an inclined ramp up which the air streams from thenozzles 56 and the blower 32 is moved along with any lint carriedthereby.

The baseplates 101 and 101' also have vertically extending adjacentportions 103 and 103 integral therewith and the upper portions of whichare bent to extend over the `base portions 101 and 101 to form inclinedplates 104 and 104. The portions 104 and 104' are provided with openingsor perforations 105 and 105" therein to permit the passage of airtherethrough and to block the passage of any lint or other 4foreignmatter-carried by the air stream passing therethrough. TheAform ofcollection bin shown in Figures l through 13 is substantially the samelength as the length of the spinning frame 12 and has both ends closedby doors 106 and 106 which are hingedly secured to the vertical portions103 and 103 thereof. e

The vertical portions 1 03 and 103 are joined together and ixedlysecured by any suitable meansv to form collection binson opposite sidesthereof to collect accumulations of lint from both directions, but it isto be understood that, if desired the collection bin 100 could bevseparated between the plates 103, 103 to form two separate bins whichwould be' used along a wall to collect accumulations of lint from onlyone direction. Although the inclined plate portions 102 and theverticall portions 103 are shown as being joined bya base plate 101, itis to be understood that, the inclined'plates 1'02 aswell as thevertical plates 103` could be suitably secured to the floor without theuse of the plate 101 therebetween.

y With the lcollection bin 100 placed on the oor beneath the spinningframe-as shown in'Figur'e ll the v.blov'vers 32 on adjacent: spinningyframes will lform a current 'of' air moving along the oor and, will moveup the inclined surface 102 along with any collection of lint lorforeign matter` carried thereby, As the current of. air is directed toand passes through the perforated portion 104 any .accumulation of lintand the like will be `stopped by the perforated plate 103 to fall intothe collection bin or trough vformed between the inclined surfaces 102and the vertical plate 103. The collection bin 100 may be cleaned outperiodically by an operator bypassing a broom or the like down thetrough and moving the accumulated lint and trash out one of the hingeddoors 106 or 106.

While the means shown is particularly adapted to be used in textilemills, the inventionv is not limited thereto as the same or similararrangements may be used to create air currents along the floors ofrooms containing other types of machines.`

Although. the collection bin 100 is shown as being mounted on the oorbeneath an open bottom textile machine 12 (Figures l0 through 13) it isto be understood that one half of the collection bin 100 could b'eeasily mounted on the lioor adjacent the side walls of the room forcollecting accumulated lint and the like. Suitable duct-work couldbeconnected to one end of the collection bins 100 to create a `movingcurrent of air along the base plates 101 of the bins to carry awaythelint accumulated by the bin 100. The duct-work connected to thecollection bins 100 could lead into the oor on which the collection bins100 are mounted and to any suitable suction element. The collection bins100, mounted beneath the machines 12 or adjacent the walls of the room,would thus be automatically cleaned by the connecting duct-work and thesuction element. v

In the drawings and specilication there has been set forth a preferredembodiment of the invention and, although specic terms are employed,they are used in a generic and descriptive sense only and not forpurposes of limitation, the scope of the invention being defined vin theclaims.

I claim:

l. In combination with elongated textile machines, devices for cleaningthe floor of a room having a plurality of textile machines therein,wherein said textile machines are open at their lowermost portions andspaced in transverse rows across the room, said devices comprisinghorizontally disposed track means mounted on the lowermost portion ofmost of the machines adjacent the iioor and longitudinally'thereof, Aablower mounted to travel along each said track means, means for drivingeach blower along its track means and means on each blower for directingstreams of air outwardly therefrom transversely of the direction oftravel of the blower and in a substantially horizontal plane only alongthe oor.

2. In combination with elongated textile machines, devices for cleaningthe floor of a room having a plurality of textile machines therein,wherein said textile machines are open at their lowermost portions andspaced in transverse rows across the room, said devices comprisinghorizontally disposed track means mounted on the lowermost portion ofmost of the machines adjacent the Hoor and longitudinally thereof, ablower mounted to travel yalong eachvsaid track means, means for drivingeach blower along its track means, means on each blower for directingstreams of air outwardly therefrom transversely of the direction oftravel of the blower and in a substantially horizontal plane only alongthe oor and means for reversing the direction of movement of the blowersupon each of the blowers reaching the end of its track means.

3. A device according to claim 2 including means for collecting thematter swept by the air streams of the blowers.

4. In combination with elongated textile machines, devices for cleaningthe floor of a roomrhaving a lpluralityl of textile machines therein,wherein said' textile machines are open at their lowermost portions andspaced in transverse rows across the room, thev space between thetransverse rows defining cross alleys, said devices comprisinghorizontally disposed track means mounted on the lowermost portion ofmost of the machines adjacent the tioor and longitudinally thereof, Aablower mounted to travel along each said track means, means fordrivingthe blower along each track means, means for reversing the direction ofmovement of said blower adjacent each end of the track means, a nozzleon each of the blowers for directing the air streams produced by theblowers outwardly fromreach machine and along the oor in a substantiallyhorizontal plane only and means mounted adjacent one end of each trackmeans for directf ing an air stream across the cross alleys upon eachtraveling blower reaching said one end of the track means.

5. In combination with elongated textile machines, devices for cleaningthe floor of a room having a plural-V ity of textile machines therein,wherein said textile machines are open at their lowermost portions andspaced in transverse rows across the room, the space between thetransverse rows defining cross alleys, said devices comprisinghorizontally disposed track meansmounted on the lowermost portion ofmost of the machines adja-` cent the floor and longitudinally thereof, ablower mounted to travel along each said track means, means for` drivingthe blower along each track means, means for reversing the direction ofmovement of said blower adjacent each end of the track means, a nozzleon each of the blowers for directing the air streams produced by theblowers outwardly transversely from each machine and along the iloor ina substantially horizontal plane only, and oscillatable means mountedadjacent one end of each track means for oscillating an air streamacross the cross alleys upon each traveling blower reaching said one endof the track means.

6. In combination with elongated textile machines, devices for cleaningthe oor of a room having a plurality of textile machines therein,wherein said textile machines are open at their lowermost portions andspaced in transverse'rows across said room, the space between thetransverse rows defining cross alleys, said devices comprising trackmeans mounted on the lowermost portion of most of the machines adjacentthe oor, a blower mounted to travel along each said track means, meansfor driving the blower along each track means, means for reversing thedirection of the` driving means of said blower adjacent each end of thetrack means, a nozzle on each of the blowers for directing the airstreams produced by the blowers outwardly from each machine and alongthe oor, an oscillatable blower mounted adjacent one end of each trackmeans for oscillating an air stream across the cross alleys, means foroscillating said oscillatable blower upon each traveling blower reachingthe end of the track -means and means for collecting the matter carriedby said air streams.

7. Apparatus for cleaning the oor of a room havingl a plurality oftextile machines therein, wherein said machines are spaced to form atleast one row across said room, said means comprising blower meansmounted on the lowermost portions of most of said machines in said rowfor directing streams of air in substantially a horizontal plane onlyalong said row of machines and toward the last of said machines in-saidrow, and an entrapping element resting upon the floor beneath said lastof said machines in said transverse row and extending transversely ofthe general direction of said streams of air for entrapping the mattercarried by said streams of air while allowing said streams of air topass through said entrapping element, said entrapping element comprisingan inclined imperforate member `for changing the direction of the airstream entering said entrapping element and an inclined perforated,plate inthe path of travel of said deected ar stream for collecting anyforeign matter carried by said air stream.

References Cited in the le of this patent UNITED STATES PATENTS HolleranJuly 31, 1923 Schmid May 31, 1927 Linder Dec. 4, 1934 Hodge et al Aug.20, 1935

